<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>

<body>
    <script>
        var a = 12;
        var b = a; // 12
        b = 13;
        console.log(a); // 12



        var n = {
            name: '孟婆'
        };
        var m = n;
        m.name = '的碗';
        console.log(n.name);
    </script>
</body>

</html>